As first reported by TV Line , the House alum will play Heather Vanowen, the CEO of a high-end PR consulting firm who crosses paths with Holmes (Jonny Lee Miller) after her company was apparently the target of a bombing.
Meanwhile, Necessary Roughness star Thorne will play Terry D'Amico, the former partner of Captain Gregson (Aidan Quinn) who may have helped him imprison the wrong man years ago. TVLine.com first reported Thorne's casting as well.
Elementary debuted last week to 13.2 million viewers and a 3.1 in the adults-18-to-49 demographic, winning the 10 p.m. hour in both measures.
Elementary airs Thursdays at 10/9c on CBS.